gedit customisation via gsettings

I am trying to programmatically customise various settings in the gedit application, and currently I’ve got the following command to change the colour scheme.

gsettings set org.gnome.gedit.preferences.editor scheme 'cobalt' 

The issue I have is, if you see below, there are some colour schemes which are two words.

gedit colour schemes

Now with that in mind, I’ve tried the following command, but with no success:

gsettings set org.gnome.gedit.preferences.editor scheme 'solarized dark'

Unfortunately, I do not get any errors or feedback to say the above command has not worked. Would anyone know what I have done wrong here?